史无明文 meaning in English

there is no historical evidence (to that effect)

On the one hand , we should try to find every clue to compensate for possible blank spots instead of simply ignoring just because there is no written document in history ; on the other hand , we should stress the close relation between " empty words " and " action " , and try to get a full picture by integrating the systems and theories of a certain period in way of offering evidences to prove
一方面，不因史无明文就以为实无其事，当尽量寻觅蛛丝马迹，以连接历史可能割断之处；另一方面，又强调历史上“空言”和“行事”的紧密关联，以因事证明的方式将相关时段的制度和理论结合起来研究，以见其全貌。